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(No Mbde'L) l G. AVP ORTER.

STEAM BOILERL No. 317,190. Patented May 5, 1 885 UNITED STATES PATENT()FFICEQ GEORGE A. PORTER, OF ZSYRAGUSE, NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part Of Letters Patent NO. 317,190, dated May 5,1885.

Application filed January 27, 1885. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. PORTER, of Syracuse, in the county ofOnondaga, in the State of New York, have invented new and usefulImprovements in Steam Boilers, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

This invention relates to the class of steamboilers which have thefire-box and ash-pit surrounded by a water-jacket; and my inventionconsists in an improved construction of the junction of the fire-boxshell with the boilershell around the fire-box door and ash-pit doorformed of a single opening, which improvement not only dispenses withthe extra ring which is usually interposed between said shells and hasthe edges thereof attached to it, but also renders-all the seams acrossthe bottom of the front of the boiler horizontal, and thus easilyaccessible for calking and tightening.

In the annexed drawings, Figure I is alongitudinal section of asteam-boiler embodying my improvement; and Figs. II and III are verticaltransverse sections, respectively, on lines as w and y y in Fig. I.

Similar letters of reference indicate corresponding parts.

A represents theboiler-shell formed at its front end with a downwardextension, which surrounds the lower portion of the fire-box B and theash-pit O and forms awater-jacket, e, around the same. The usual flueswhich conduct the products of combustion from the firebox to the stackmay be arranged in any suitable and well-known manner, and inasmuch assaid features have no bearing on my invention it is unnecessary to heredescribe the same. 7

The frontendoftheboiler-shellIprovide with a single opening, 0, reachingfrom above the grate g to the bottom of the ash-pit,and around the saidopening I form on the aforesaid shell an inwardly-projecting flange, a.The firebox and ash-pit are formed of a single shell, the front sheet,which I provide also with a single opening corresponding to the openingo aforesaid, and said sheet I provide with an outwardly-projectingflange,b,around the said opening, which flange is made to lap onto theexterior of the flange a, as shown in Figs. I and III of thedrawings,and is riveted thereto, thus dispensing with the usual extraring hereinbefore referred to and requiring only a single row ofrivets'and forming a single and easily-accessible calkingseam.Furthermore, the single door reaching to the bottom of the ash-pitpermits of setting the grate higher or lower, according to thecomparative capacities of the firebox and ash-pit required for difierentkinds of fuel, thus allowing the boiler to be converted from a coal to awood or straw burning boiler. The front end sheet of the fire-box andash-pitI provide around its margin with an inwardly projecting flange,c, which is riveted to the inner side of the top and sides of thefire-box and ash-pit shell. The bottom sheet of the latter, however,Ilap onto the top of the bottom flange, c, which at this point is on aline with or in the same plane with the flange b, as shown in Fig. I ofthe drawings, to which portion of the flangec I rivet directly theoverlapping portion of the bottom sheet, (I, thus bringing the bottom ofthe ash-pit as near as possible even with the bottom of the door, andconsequently allowing the ashes to be easily scraped out of the ash-pitwhen required.

It will be observed that by the described construction of the bottomflanges, c b, in one and the same horizontal plane I bridge over thebottom portion of the front water-space and connect with the bottomsheet of the ashpit in such a manner as to obviate obstructions to theremoval of the ashes and form none but horizontal seams,which are easilyaccessible for calking and tightening from the front of the boiler.

Having described my invention, whatI claim as new, and desire to secureby Letters Patent, 1s

In a steam-boiler having its fire-box and ash-pit surrounded by awaterjacket, as shown, the front sheet of the boiler-shell provided witha single opening extending from above the grate to the bottom of theash-pit and formed with inwardly-projecting flangea around said opening,the firebox and ash-pit shell having the front sheet formed with acorresponding single opening andwith outwardlyprojecting flange 1)around said opening lap- IOC ping onto the exterior of the flange a andriv- In testimony whereof Ihave hereunto signed IO eted directlythereto, said sheet being also my name and affixed my seal, in thepresence provided with an inwardly-projecting marof two attestingwitnesses, at Syracusefln the ginal flange, c, the bottom portion ofwhich is county of Onondaga, in the State of New York,

5 in the same plane as the outer flange, Z2, and this 24th day ofJanuary, 1885.

the bottom sheet, (2, lapped onto the top of GEORGE A. PORTER. [L. s.]said bottom flange, c, and riveted directly Witnesses: thereto, allconstructed and combined sub- FREDERICK H. GIBBS,

stantially in the manner specified and shown. 0. BENDIXON.

